To provide a portable biological data measuring apparatus capable of
measuring, storing and displaying biological data of a human being, in
particular. The apparatus includes a GND electrode (12B) and a minus
electrode (12C) which are provided on the opposite side faces of a
roughly rectangular parallelopiped-shaped chassis (11), and a plus
electrode (12A) provided on the face curved into an elliptical arc shape
in cross section and adjacent to the opposite faces on which the GND
electrode (12B) and the minus electrode (12C) are provided, in which
biological data is measured using the plus electrode (12A), the GND
electrode (12B) and the minus electrode (12C).